Wound therapy system with wound volume estimation using geometric approximation

ABSTRACT

A wound therapy system includes an instillation fluid canister configured to contain an instillation fluid, a pump fluidly coupled to the instillation fluid canister and operable to deliver the instillation fluid from the instillation fluid canister to a wound, a user interface configured to receive user input indicating one or more geometric attributes of the wound, and a controller electronically coupled to the pump and the user interface. The controller is configured to determine a volume of the wound based on the user input, determine a volume of the instillation fluid to deliver to the wound based on the volume of the wound, and operate the pump to deliver the determined volume of the instillation fluid to the wound.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority to U.S. ProvisionalApplication No. 62/690,588, filed on Jun. 27, 2018, which isincorporated herein by reference in its entirety.

BACKGROUND

The present disclosure relates generally to a wound therapy system, andmore particularly to a wound therapy system configured to estimate thevolume of a wound.

Negative pressure wound therapy (NPWT) is a type of wound therapy thatinvolves applying a negative pressure to a wound site to promote woundhealing. Some wound treatment systems apply negative pressure to a woundusing a pneumatic pump to generate the negative pressure and flowrequired. Recent advancements in wound healing with NPWT involveapplying topical fluids to wounds to work in combination with NPWT.However, it can be difficult to determine the appropriate volume ofinstillation fluid to deliver to the wound.

SUMMARY

One implementation of the present disclosure is a wound therapy system.The wound therapy system includes an instillation fluid canisterconfigured to contain an instillation fluid, a pump fluidly coupled tothe instillation fluid canister and operable to deliver the instillationfluid from the instillation fluid canister to a wound, a user interfaceconfigured to receive user input indicating one or more geometricattributes of the wound, and a controller electronically coupled to thepump and the user interface. The controller is configured to determine avolume of the wound based on the user input, determine a volume of theinstillation fluid to deliver to the wound based on the volume of thewound, and operate the pump to deliver the determined volume of theinstillation fluid to the wound.

In some embodiments, the one or more geometric attributes of the woundinclude at least one of a width, a height, or a depth of the wound. Thecontroller can be configured to determine the volume of the wound byapplying at least one of the width, the height, or the depth of thewound as an input to a wound volume model.

In some embodiments, the one or more geometric attributes of the woundinclude a wound shape. The controller can be configured to select awound volume model based on the wound shape and determine the volume ofthe wound using the selected wound volume model.

In some embodiments, the one or more geometric attributes of the woundfurther include at least one of a width, a height, or a depth of thewound. The controller can be configured to determine the volume of thewound by applying at least one of the width, the height, or the depth ofthe wound as an input to the selected wound volume model.

In some embodiments, the wound volume model defines a relationshipbetween the one or more geometric attributes of the wound and the volumeof the wound.

In some embodiments, the wound volume model is a rectangular volumemodel and the controller is configured to determine the volume of thewound by multiplying the width, the height, and the depth.

In some embodiments, the wound volume model is an elliptical cylindervolume model and the controller is configured to determine the volume ofthe wound by calculating an ellipse area using the length and the widthand multiplying the ellipse area by the depth.

In some embodiments, the wound volume model is a prolate ellipsoidvolume model and the controller is configured to determine the volume ofthe wound based on a volume of a prolate ellipsoid having the length,the width, and the depth. In some embodiments, the controller isconfigured to determine the volume of the wound by calculating half thevolume of the prolate ellipsoid having the length, the width, and thedepth.

In some embodiments, the wound therapy system includes a measurementdevice configured to measure a size of the wound along multipledimensions of the wound simultaneously. In some embodiments, themeasurement device includes a graduated scale printed on packaging ofthe wound therapy system. In some embodiments, the measurement deviceincludes a transparent sheet having markings indicating length andthrough which the wound is visible when the measurement device isapplied to a surface of the wound.

In some embodiments, the wound therapy system includes one or moretables that define the volume of the wound as a function of the one ormore geometric attributes of the wound. In some embodiments, the userinput includes the volume of the wound defined by the one or moretables.

In some embodiments, the controller is configured to determine thevolume of instillation fluid to deliver to the wound by multiplying thevolume of the wound by a fluid instillation factor. In some embodiments,the fluid instillation factor is less than one such that less than atotal volume of the wound is filled with the instillation fluid. In someembodiments, the fluid instillation factor is between approximately 0.2and approximately 0.8.

In some embodiments, the wound therapy system includes a wound dressingsealable to skin surrounding the wound.

In some embodiments, the wound therapy system includes tubing fluidlycoupling the pump with the wound. The pump may deliver the determinedvolume of the instillation fluid to the wound via the tubing.

In some embodiments, the controller is configured to operate the pump toapply negative pressure to the wound.

In some embodiments, the controller is configured to determine thevolume of the wound at a plurality of times during wound treatment anddetermine healing progression based on changes in the volume of thewound during wound treatment.

Another implementation of the present disclosure is a method fordelivering instillation fluid to a wound. The method includes receivinguser input indicating one or more geometric attributes of the wound at auser interface of a wound therapy device, determining a volume of thewound based on the user input, determining a volume of the instillationfluid to deliver to the wound based on the volume of the wound, andoperating a pump of the wound therapy device to deliver the determinedvolume of the instillation fluid from an instillation fluid canister tothe wound.

In some embodiments, the one or more geometric attributes of the woundinclude at least one of a width, a height, or a depth of the wound. Insome embodiments, determining the volume of the wound includes applyingat least one of the width, the height, or the depth of the wound as aninput to a wound volume model.

In some embodiments, the one or more geometric attributes of the woundinclude a wound shape. The method may further include selecting a woundvolume model based on the wound shape and determining the volume of thewound using the selected wound volume model.

In some embodiments, the one or more geometric attributes of the woundfurther include at least one of a width, a height, or a depth of thewound. In some embodiments, determining the volume of the wound includesapplying at least one of the width, the height, or the depth of thewound as an input to the selected wound volume model.

In some embodiments, the wound volume model defines a relationshipbetween the one or more geometric attributes of the wound and the volumeof the wound.

In some embodiments, the wound volume model is a rectangular volumemodel and determining the volume of the wound includes multiplying thewidth, the height, and the depth.

In some embodiments, the wound volume model is an elliptical cylindervolume model and determining the volume of the wound includescalculating an ellipse area using the length and the width andmultiplying the ellipse area by the depth.

In some embodiments, the wound volume model is a prolate ellipsoidvolume model and determining the volume of the wound based on a volumeof a prolate ellipsoid having the length, the width, and the depth. Insome embodiments, determining the volume of the wound includescalculating half the volume of the prolate ellipsoid having the length,the width, and the depth.

In some embodiments, the method includes using a measurement device tomeasure a size of the wound along multiple dimensions of the woundsimultaneously. In some embodiments, the measurement device includes agraduated scale printed on packaging of the wound therapy system. Insome embodiments, the measurement device includes a transparent sheethaving markings indicating length and through which the wound is visiblewhen the measurement device is applied to a surface of the wound.

In some embodiments, the method includes using one or more tables todetermine the volume of the wound as a function of the one or moregeometric attributes of the wound. In some embodiments, the user inputincludes the volume of the wound defined by the one or more tables.

In some embodiments, determining the volume of instillation fluid todeliver to the wound includes multiplying the volume of the wound by afluid instillation factor. In some embodiments, the fluid instillationfactor is less than one such that less than a total volume of the woundis filled with the instillation fluid. In some embodiments, the fluidinstillation factor is between approximately 0.2 and approximately 0.8.

In some embodiments, the method includes sealing a wound dressing toskin surrounding the wound.

In some embodiments, the method includes fluidly coupling the pump withthe wound via tubing. In some embodiments, the determined volume of theinstillation fluid is delivered to the wound via the tubing.

In some embodiments, the method includes operating the pump to applynegative pressure to the wound.

In some embodiments, the method includes determining the volume of thewound at a plurality of times during wound treatment and determininghealing progression based on changes in the volume of the wound duringwound treatment.

Those skilled in the art will appreciate that the summary isillustrative only and is not intended to be in any way limiting. Otheraspects, inventive features, and advantages of the devices and/orprocesses described herein, as defined solely by the claims, will becomeapparent in the detailed description set forth herein and taken inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a wound therapy system including a therapydevice coupled to a wound dressing via tubing, according to an exemplaryembodiment.

FIG. 2 is a block diagram illustrating the therapy device of FIG. 1 ingreater detail when the therapy device operates to draw a vacuum withina negative pressure circuit, according to an exemplary embodiment.

FIG. 3 is a block diagram illustrating the therapy device of FIG. 1 ingreater detail when the therapy device operates to vent the negativepressure circuit, according to an exemplary embodiment.

FIG. 4 is a block diagram illustrating the therapy device of FIG. 1 ingreater detail when the therapy device operates to deliver instillationfluid to the wound dressing and/or a wound, according to an exemplaryembodiment.

FIG. 5 is a block diagram illustrating a controller of the therapydevice of FIG. 1 in greater detail, according to an exemplaryembodiment.

FIG. 6 is a fill assist interface which can be generated by the therapydevice of FIG. 1, according to an exemplary embodiment.

FIG. 7A is an illustration of a rectangular wound shape which can beselected via the fill assist interface of FIG. 6, according to anexemplary embodiment.

FIG. 7B is an illustration of an ellipse cylinder wound shape which canbe selected via the fill assist interface of FIG. 6, according to anexemplary embodiment.

FIG. 7C is an illustration of a prolate ellipsoid wound shape which canbe selected via the fill assist interface of FIG. 6, according to anexemplary embodiment.

FIG. 7D is an illustration of a triangular wound shape which can beselected via the fill assist interface of FIG. 6, according to anexemplary embodiment.

FIG. 8 is a drawing of a measurement tool which can be part of the woundtherapy system of FIG. 1, according to an exemplary embodiment.

FIG. 9 is a drawing of the measurement tool of FIG. 8 overlaid onto awound during wound size measurement, according to an exemplaryembodiment.

FIG. 10 is a set of rectangular reference tables for estimating thevolume of a wound having a rectangular wound shape, according to anexemplary embodiment.

FIG. 11 is a set of ellipse cylinder reference tables for estimating thevolume of a wound having an ellipse cylinder wound shape, according toan exemplary embodiment.

FIG. 12 is a set of prolate ellipsoid reference tables for estimatingthe volume of a wound having a prolate ellipsoid wound shape, accordingto an exemplary embodiment.

FIG. 13 is a flowchart of a process for automatically estimating a woundvolume based on geometric attributes of the wound and deliveringinstillation fluid to the wound based on the estimated wound volume,according to an exemplary embodiment.

FIG. 14 is a flowchart of a process for estimating a wound volume usingreference tables and delivering instillation fluid to the wound based onthe estimated wound volume, according to an exemplary embodiment.

DETAILED DESCRIPTION

Overview

Referring generally to the FIGURES, a wound therapy system with fluidinstillation and components thereof are shown, according to variousexemplary embodiments. The wound therapy system may include a therapydevice and a wound size measurement tool. The therapy device may includean instillation fluid canister, a removed fluid canister, a valve, apneumatic pump, an instillation pump, and/or a controller. The therapydevice can be configured to deliver instillation fluid to the wound andprovide negative pressure wound therapy (NPWT) by maintaining the woundat negative pressure.

In some embodiments, the therapy device includes a user interfaceconfigured to receive user input indicating one or more geometricattributes of the wound. The geometric attributes can include, forexample, a width of the wound, a height or length of the wound, a depthof the wound, a geometric shape of the wound (e.g., rectangular, ellipsecylinder, prolate ellipsoid, triangular, etc.), or other attributes thatindicate the size and/or shape of the wound. The controller can use thegeometric attributes entered via the user interface to determine avolume of the wound. In other embodiments, the user interface allows auser to enter a volume of the wound directly without specifyinggeometric attributes. The controller can determine an amount ofinstillation fluid to deliver to the wound based on the estimated woundvolume. These and other features of the wound therapy system aredescribed in detail below.

Wound Therapy System

Referring now to FIGS. 1-4, a negative pressure wound therapy (NPWT)system 100 is shown, according to an exemplary embodiment. NPWT system100 is shown to include a therapy device 102 fluidly connected to awound dressing 112 via tubing 108 and 110. Wound dressing 112 may beadhered or sealed to a patient's skin 116 surrounding a wound 114.Several examples of wound dressings 112 which can be used in combinationwith NPWT system 100 are described in detail in U.S. Pat. No. 7,651,484granted Jan. 26, 2010, U.S. Pat. No. 8,394,081 granted Mar. 12, 2013,U.S. patent application Ser. No. 14/087,418 filed Nov. 22, 2013, andU.S. Provisional Patent Application No. 62/650,132 filed Mar. 29, 2018.The entire disclosure of each of these patents and patent applicationsis incorporated by reference herein.

Therapy device 102 can be configured to provide negative pressure woundtherapy by reducing the pressure at wound 114. Therapy device 102 candraw a vacuum at wound 114 (relative to atmospheric pressure) byremoving wound exudate, air, and other fluids from wound 114. Woundexudate may include fluid that filters from a patient's circulatorysystem into lesions or areas of inflammation. For example, wound exudatemay include water and dissolved solutes such as blood, plasma proteins,white blood cells, platelets, and red blood cells. Other fluids removedfrom wound 114 may include instillation fluid 105 previously deliveredto wound 114. Instillation fluid 105 can include, for example, acleansing fluid, a prescribed fluid, a medicated fluid, an antibioticfluid, or any other type of fluid which can be delivered to wound 114during wound treatment. Instillation fluid 105 may be held in aninstillation fluid canister 104 and controllably dispensed to wound 114via instillation fluid tubing 108. In some embodiments, instillationfluid canister 104 is detachable from therapy device 102 to allowcanister 106 to be refilled and replaced as needed.

Fluids 107 removed from wound 114 pass through removed fluid tubing 110and are collected in removed fluid canister 106. Removed fluid canister106 may be a component of therapy device 102 configured to collect woundexudate and other fluids 107 removed from wound 114. In someembodiments, removed fluid canister 106 is detachable from therapydevice 102 to allow canister 106 to be emptied and replaced as needed. Alower portion of canister 106 may be filled with wound exudate and otherfluids 107 removed from wound 114, whereas an upper portion of canister106 may be filled with air. Therapy device 102 can be configured to drawa vacuum within canister 106 by pumping air out of canister 106. Thereduced pressure within canister 106 can be translated to wound dressing112 and wound 114 via tubing 110 such that wound dressing 112 and wound114 are maintained at the same pressure as canister 106.

Referring particularly to FIGS. 2-4, block diagrams illustrating therapydevice 102 in greater detail are shown, according to an exemplaryembodiment. Therapy device 102 is shown to include a pneumatic pump 120,an instillation pump 122, a valve 132, a filter 128, and a controller118. Pneumatic pump 120 can be fluidly coupled to removed fluid canister106 (e.g., via conduit 136) and can be configured to draw a vacuumwithin canister 106 by pumping air out of canister 106. In someembodiments, pneumatic pump 120 is configured to operate in both aforward direction and a reverse direction. For example, pneumatic pump120 can operate in the forward direction to pump air out of canister 106and decrease the pressure within canister 106. Pneumatic pump 120 canoperate in the reverse direction to pump air into canister 106 andincrease the pressure within canister 106. Pneumatic pump 120 can becontrolled by controller 118, described in greater detail below.

Similarly, instillation pump 122 can be fluidly coupled to instillationfluid canister 104 via tubing 109 and fluidly coupled to wound dressing112 via tubing 108. Instillation pump 122 can be operated to deliverinstillation fluid 105 to wound dressing 112 and wound 114 by pumpinginstillation fluid 105 through tubing 109 and tubing 108, as shown inFIG. 4. Instillation pump 122 can be controlled by controller 118,described in greater detail below.

Filter 128 can be positioned between removed fluid canister 106 andpneumatic pump 120 (e.g., along conduit 136) such that the air pumpedout of canister 106 passes through filter 128. Filter 128 can beconfigured to prevent liquid or solid particles from entering conduit136 and reaching pneumatic pump 120. Filter 128 may include, forexample, a bacterial filter that is hydrophobic and/or lipophilic suchthat aqueous and/or oily liquids will bead on the surface of filter 128.Pneumatic pump 120 can be configured to provide sufficient airflowthrough filter 128 that the pressure drop across filter 128 is notsubstantial (e.g., such that the pressure drop will not substantiallyinterfere with the application of negative pressure to wound 114 fromtherapy device 102).

Valve 132 can be fluidly connected with pneumatic pump 120 and filter128 via conduit 136. In some embodiments, valve 132 is configured tocontrol airflow between conduit 136 and the environment around therapydevice 102. For example, valve 132 can be opened to allow airflow intoconduit 136 via vent 134 and conduit 138, and closed to prevent airflowinto conduit 136 via vent 134 and conduit 138. Valve 132 can be openedand closed by controller 118. When valve 132 is closed, pneumatic pump120 can draw a vacuum within a negative pressure circuit by causingairflow through filter 128 in a first direction, as shown in FIG. 2. Thenegative pressure circuit may include any component of system 100 thatcan be maintained at a negative pressure when performing negativepressure wound therapy (e.g., conduit 136, removed fluid canister 106,tubing 110, wound dressing 112, and/or wound 114). For example, thenegative pressure circuit may include conduit 136, removed fluidcanister 106, tubing 110, wound dressing 112, and/or wound 114. Whenvalve 132 is open, airflow from the environment around therapy device102 may enter conduit 136 via vent 134 and conduit 138 and fill thevacuum within the negative pressure circuit. The airflow from conduit136 into canister 106 and other volumes within the negative pressurecircuit may pass through filter 128 in a second direction, opposite thefirst direction, as shown in FIG. 3.

In some embodiments, therapy device 102 includes a variety of sensors.For example, therapy device 102 is shown to include a pressure sensor130 configured to measure the pressure within canister 106 and/or thepressure at wound dressing 112 or wound 114. Pressure measurementsrecorded by pressure sensor 130 can be communicated to controller 118.Controller 118 use the pressure measurements to ensure that wound 114 ismaintained at negative pressure. For example, controller 118 canactivate pneumatic pump 120 in response to the pressure measurement frompressure sensor 130 exceeding a negative pressure setpoint in order toreduce the pressure at wound 114.

In some embodiments, therapy device 102 includes a user interface 126.User interface 126 may include one or more buttons, dials, sliders,keys, or other input devices configured to receive input from a user.User interface 126 may also include one or more display devices (e.g.,LEDs, LCD displays, etc.), speakers, tactile feedback devices, or otheroutput devices configured to provide information to a user. In someembodiments, the pressure measurements recorded by pressure sensor 130are presented to a user via user interface 126. User interface 126 canalso display alerts generated by controller 118. For example, controller118 can generate a “no canister” alert if canister 106 is not detectedand present the no canister alert via user interface 126.

In some embodiments, user interface 126 is configured to receive userinput indicating one or more geometric attributes of wound 114. Thegeometric attributes can include, for example, a width of wound 114, aheight or length of wound 114, a depth of wound 114, a geometric shapeof wound 114 (e.g., rectangular, ellipse cylinder, prolate ellipsoid,triangular, etc.), or other attributes that indicate the size and/orshape of wound 114. Controller 118 can use the geometric attributesentered via user interface 126 to determine a volume of wound 114 anddetermine an amount of instillation fluid 105 to deliver to wound 114based on the estimated wound volume. In other embodiments, userinterface 126 allows a user to enter a volume of wound 114 directlywithout specifying geometric attributes.

Referring now to FIG. 6, a fill assist interface 200 which can bepresented via user interface 126 is shown, according to an exemplaryembodiment. Fill assist interface 200 may prompt a user to select awound shape 206 and may include an illustration of the selected woundshape 206. Selecting either of arrows 202 and 204 may cause fill assistinterface 200 to cycle through a set of wound shapes 206 which can beselected (e.g., rectangular, ellipse cylinder, prolate ellipsoid,triangular prism, etc.). In FIG. 6, fill assist interface 200 is showndisplaying an ellipse cylinder wound shape 206 having a width x, aheight y, and a depth z. However, wound shape 206 may switch to otherwound shapes in response to a user selecting either of arrows 202 and204. Several other wound shapes 206 which can be selected and displayedvia fill assist interface 200 are shown in FIGS. 7A-7D.

Fill assist interface 200 is shown to include geometric attributeselectors 208, 210, and 212. Each of geometric attribute selectors208-212 may correspond to a particular dimension of the selected woundshape 206 and may allow a user to specify the size of wound 114 alongthat dimension. For example, selector 208 corresponds to the widthdimension x and allows a user to specify the width x of wound 114.Similarly, selector 210 corresponds to the height dimension y and allowsa user to specify the height y of wound 114, whereas selector 212corresponds to the depth dimension z and allows a user to specify thedepth z of wound 114. The user can select from any of the preset valuesshown in fill assist interface 200 (e.g., 10 mm, 20 mm, 30 mm, etc.) orenter a custom value not shown in fill assist interface 200 (e.g., 27mm, 31 mm, etc.).

Referring again to FIGS. 1-4, in some embodiments, therapy device 102includes a data communications interface 124 (e.g., a USB port, awireless transceiver, etc.) configured to receive and transmit data.Communications interface 124 may include wired or wirelesscommunications interfaces (e.g., jacks, antennas, transmitters,receivers, transceivers, wire terminals, etc.) for conducting datacommunications external systems or devices. In various embodiments, thecommunications may be direct (e.g., local wired or wirelesscommunications) or via a communications network (e.g., a WAN, theInternet, a cellular network, etc.). For example, communicationsinterface 124 can include a USB port or an Ethernet card and port forsending and receiving data via an Ethernet-based communications link ornetwork. In another example, communications interface 124 can include aWi-Fi transceiver for communicating via a wireless communicationsnetwork or cellular or mobile phone communications transceivers.

Controller 118 can be configured to operate pneumatic pump 120,instillation pump 122, valve 132, and/or other controllable componentsof therapy device 102. In some embodiments, controller 118 automaticallydetermines the volume of wound 114 based on user input received via userinterface 126. For example, controller 118 can determine the volume ofwound 114 by applying the geometric attributes of wound 114 (e.g., woundshape, height, width, depth, etc.) as an input to a wound volume model.In some embodiments, controller 118 uses the specified wound shape toselect an appropriate wound volume model. For example, controller 118can select a rectangular wound volume model in response to a userselecting a rectangular wound shape via user interface 126, a prolateellipsoid wound volume model in response to a user selecting a prolateellipsoid wound shape via user interface 126, or any other type ofgeometric model in response to a user selecting the corresponding woundshape via user interface 126.

In some embodiments, controller 118 applies the specified height, width,depth, or other geometric attributes of wound 114 as inputs to theselected wound volume model to calculate the volume of wound 114. Forexample, the rectangular wound volume model may define the volume ofwound 114 as a product of the width x, height y, and depth z of wound114 (i.e., V_(wound)=xyz), whereas the prolate ellipsoid wound volumemodel may define the volume of wound 114 as V_(wound)=⅔πabs (i.e., halfthe volume of a prolate ellipsoid), where a is the radius of wound 114along the width dimension (i.e., a=x/2), b is the radius of wound 114along the height dimension (i.e., b=y/2), and c is the radius of wound114 along the depth dimension (i.e., c=z). In other embodiments,controller 118 determines the volume of wound 114 directly from the userinput. For example, a user can specify the volume of wound 114 via userinterface 126 such that controller 118 can determine the volume of wound114 without performing any calculations.

Controller 118 can determine a volume of instillation fluid 105 todeliver to wound 114 based on the volume of wound 114. In someembodiments, controller 118 determines the volume V_(fluid) ofinstillation fluid 105 to deliver to wound 114 by multiplying the volumeV_(wound) of wound 114 by a fluid instillation factor α (i.e.,V_(fluid)=αV_(wound)) The fluid instillation factor α may be less thanone such that less than the total volume V_(wound) of wound 114 isfilled with instillation fluid 105. In some embodiments, the fluidinstillation factor α is between approximately 0.2 and approximately0.8. Controller 118 can then operate instillation pump 122 to deliverthe determined volume V_(fluid) of instillation fluid 105 to wound 114.These and other features of controller 118 are described in greaterdetail below.

Controller

Referring now to FIG. 5, a block diagram illustrating controller 118 ingreater detail is shown, according to an exemplary embodiment.Controller 118 is shown to include a processing circuit 140 including aprocessor 142 and memory 144. Processor 142 may be a general purpose orspecific purpose processor, an application specific integrated circuit(ASIC), one or more field programmable gate arrays (FPGAs), a group ofprocessing components, or other suitable processing components.Processor 142 is configured to execute computer code or instructionsstored in memory 144 or received from other computer readable media(e.g., CDROM, network storage, a remote server, etc.).

Memory 144 may include one or more devices (e.g., memory units, memorydevices, storage devices, etc.) for storing data and/or computer codefor completing and/or facilitating the various processes described inthe present disclosure. Memory 144 may include random access memory(RAM), read-only memory (ROM), hard drive storage, temporary storage,non-volatile memory, flash memory, optical memory, or any other suitablememory for storing software objects and/or computer instructions. Memory144 may include database components, object code components, scriptcomponents, or any other type of information structure for supportingthe various activities and information structures described in thepresent disclosure. Memory 144 may be communicably connected toprocessor 142 via processing circuit 140 and may include computer codefor executing (e.g., by processor 142) one or more processes describedherein. When processor 142 executes instructions stored in memory 144,processor 142 generally configures controller 118 (and more particularlyprocessing circuit 140) to complete such activities.

Controller 118 is shown to include a pump controller 146 and a valvecontroller 150. Pump controller 146 can be configured to operate pumps120 and 122 by generating and providing control signals to pumps120-122. The control signals provided to pumps 120-122 can cause pumps120-122 to activate, deactivate, or achieve a variable capacity or speed(e.g., operate at half speed, operate at full speed, etc.). Similarly,valve controller 150 can be configured to operate valve 132 bygenerating and providing control signals to valve 132. The controlsignals provided to valve 132 can cause valve 132 to open, close, orachieve a specified intermediate position (e.g., one-third open, halfopen, etc.). In some embodiments, pump controller 146 and valvecontroller 150 are used by other components of controller 118 (e.g.,instillation fluid controller 148, wound volume estimator 156, etc.) tooperate pumps 120-122 and valve 132 when carrying out the processesdescribed herein.

In some embodiments, pump controller 146 uses input from a canistersensor configured to detect whether removed fluid canister 106 ispresent. Pump controller 146 can be configured to activate pneumaticpump 120 only when removed fluid canister 106 is present. For example,pump controller 146 can check whether canister 106 is present and canactivate pneumatic pump 120 in response to a determination that canister106 is present. However, if canister 106 is not present, pump controller146 may prevent pneumatic pump 120 from activating. Similarly, pumpcontroller 146 can be configured to activate instillation pump 122 onlywhen instillation fluid canister 104 is present. For example, pumpcontroller 146 can check whether canister 104 is present and canactivate instillation pump 122 in response to a determination thatcanister 104 is present. However, if canister 104 is not present, pumpcontroller 146 may prevent instillation pump 122 from activating.

Controller 118 is shown to include a wound shape detector 152 and awound volume model selector 154. Wound shape detector 152 can beconfigured to identify the wound shape specified via user interface 126.A user can select any of a variety of wound shapes that most closelymatches the shape of wound 114. Examples of wound shapes that can beselected via user interface 126 may include a rectangular wound shape,an elliptical cylinder wound shape, a prolate ellipsoid wound shape, atriangular prism wound shape, or any other wound shape. Several examplesof wound shapes 206 a-206 d which can be selected via user interface 126and detected by wound shape detector 152 are shown in FIGS. 7A-7B. Woundshape detector 152 can provide an indication of the selected wound shapeto wound volume model selector 154.

Wound volume model selector 154 can be configured to select a woundvolume model corresponding to the wound shape detected by wound shapedetector 152. Wound volume model selector 154 may store a variety ofdifferent wound volume models, each of which corresponds to a differentwound shape. Each wound volume model may be a geometric model thatdefines the volume V_(wound) of wound 114 as a function of the geometricattributes received via user interface 126 (e.g., the width x, height y,and depth z of wound 114). The function that relates the volumeV_(wound) of wound 114 to the geometric attributes x, y, and z may varybased on the selected wound shape.

Referring now to FIG. 7A, a rectangular wound shape 206 a is shown,according to an exemplary embodiment. Rectangular wound shape 206 a isshown to include a width x, a height y, and a depth z. Wound volumemodel selector 154 may select a rectangular wound volume model inresponse to wound shape detector 152 detecting rectangular wound shape206 a. The rectangular wound volume model may define the volumeV_(wound) of wound 114 as a product of the width x, height y, and depthz as shown in the following equation:

V _(wound) =xyz

where x is the width of wound 114, y is the height of wound 114, and zis the depth of wound 114.

Referring now to FIG. 7B, an ellipse cylinder wound shape 206 b isshown, according to an exemplary embodiment. Ellipse cylinder woundshape 206 b is shown to include a width x, a height y, and a depth z.Wound volume model selector 154 may select an ellipse cylinder woundvolume model in response to wound shape detector 152 detecting ellipsecylinder shape 206 b. The ellipse cylinder wound volume model may definethe volume V_(wound) of wound 114 as a function of axial radii a and band cylinder depth c, as shown in the following equation:

V _(wound) =πabc

where a is the axial radius of wound 114 along the width dimension x(i.e., a=x/2), b is the axial radius of wound 114 along the heightdimension y (i.e., b=y/2), and c is the depth of wound 114 along thedepth dimension z (i.e., c=z).

Referring now to FIG. 7C, a prolate ellipsoid wound shape 206 c isshown, according to an exemplary embodiment. Prolate ellipsoid woundshape 206 c is shown to include a width x, a height y, and a depth z.Wound volume model selector 154 may select a prolate ellipsoid woundvolume model in response to wound shape detector 152 detecting prolateellipsoid wound shape 206 c. The prolate ellipsoid wound volume modelmay define the volume V_(wound) of wound 114 as a function of axialradii a, b, and c, as shown in the following equation:

V _(wound)=⅔πabc

where a is the axial radius of wound 114 along the width dimension(i.e., a=x/2), b is the axial radius of wound 114 along the heightdimension (i.e., b=y/2), and c is the axial radius of wound 114 alongthe depth dimension (i.e., c=z). The volume V_(wound) of prolateellipsoid wound shape 206 c can be defined as half the volume of aprolate ellipsoid having axial radii a, b, and c.

Referring now to FIG. 7D, a triangular wound shape 206 d is shown,according to an exemplary embodiment. Triangular wound shape 206 d isshown to include a width x, a height y, and a depth z. Wound volumemodel selector 154 may select a triangular wound volume model inresponse to wound shape detector 152 detecting triangular wound shape206 d. The triangular wound volume model may define the volume V_(wound)of wound 114 as a function of the width x, height y, and depth z asshown in the following equation:

$V_{wound} = \frac{xyz}{2}$

where x is the width of a triangular face of wound 114, y is the heightof wound 114, and z is the depth of a triangular face of wound 114.

Referring again to FIG. 5, controller 118 is shown to include a woundvolume estimator 156 and a fluid instillation controller 148. Woundvolume estimator 156 may receive the selected wound volume model fromwound volume selector 154 and may receive the geometric attributes ofwound 114 (e.g., width x, height y, and depth z) from user interface126. Wound volume estimator 156 may apply the geometric attributes asinputs to the selected wound volume model to calculate the volumeV_(wound) of wound 114. In some embodiments, wound volume estimator 156calculates the variables a, b, and c based on the values of x, y, and zfor use in the ellipse cylinder wound volume model and the prolateellipsoid wound volume model, as shown in the following equations:

${a = \frac{x}{2}}{b = \frac{y}{2}}{c = z}$

In some embodiments, the user input received via user interface 126includes the wound volume V_(wound). In this scenario, wound volumeestimator 156 can estimate the volume V_(wound) of wound 114 directlyfrom the user input (i.e., by simply identifying the user-specifiedwound volume) without performing any calculations. Wound volumeestimator 156 may provide the estimated wound volume V_(wound) toinstillation fluid controller 148.

Instillation fluid controller 148 can determine a volume of instillationfluid 105 to deliver to wound 114 based on the volume V_(wound) of wound114. In some embodiments, instillation fluid controller 148 determinesthe volume V_(fluid) of instillation fluid 105 to deliver to wound 114by multiplying the volume V_(wound) of wound 114 by a fluid instillationfactor α, as shown in the following equation:

V _(fluid) =αV _(wound)

In some embodiments, the fluid instillation factor α is less than onesuch that less than the total volume V_(wound) of wound 114 is filledwith instillation fluid 105. For example, the fluid instillation factorα may be between approximately 0.2 and approximately 0.8. Instillationfluid controller 148 can then operate instillation pump 122 to deliverthe determined volume V_(fluid) of instillation fluid 105 to wound 114(e.g., by providing control signals to pump controller 146).

Measurement Tool

Referring now to FIGS. 8-9, a measurement tool 250 is shown, accordingto an exemplary embodiment. Measurement tool 250 may be part of woundtherapy system 100 and can be used to measure the width x, height y,depth z, and/or other geometric attributes of wound 114. Themeasurements provided by measurement tool 250 can be provided as aninput to fill assist interface 200. In some embodiments, measurementtool 250 is configured to measure a size of wound 114 along multipledimensions of wound 114 simultaneously. For example, measurement tool250 is shown to include a two-dimensional graduated scale 254 that canbe used to simultaneously measure the width x and height y of wound 114.

In some embodiments, measurement tool 250 includes a transparent sheet256 having markings (i.e., graduated scale 254) indicating the size ofwound 114 along multiple dimensions. As shown in FIG. 9, wound 114 maybe visible through transparent sheet 256 when measurement tool 250 isapplied to a surface of wound 114 and/or overlaid with wound 114. Insome embodiments, graduated scale 254 is printed on transparent orsemi-transparent packaging 252 of wound therapy system 100. In otherembodiments, graduated scale 254 and transparent sheet 256 may beincluded as a separate component of wound therapy system 100 (i.e., aseparate transparent sheet) within packaging 252.

Reference Tables

Referring now to FIGS. 10-12, several reference tables 260-284 areshown, according to an exemplary embodiment. Reference tables 260-284may define the volume V_(wound) of wound 114 as a function of the widthx, height y, depth z, and/or other geometric attributes of wound 114.Reference tables 260-284 can be used as an alternative to the automaticwound volume calculations performed by wound volume estimator 156. Insome embodiments, reference tables 260-284 are part of wound therapysystem 100 and may be included within the packaging of wound therapysystem 100.

Referring particularly to FIG. 10, a set of rectangular reference tables260, 262, and 264 are shown. Rectangular reference tables 260-264 can beused to estimate the volume of wound 114 when wound 114 has arectangular wound shape 206 a. Area table 260 defines the area A_(wound)of wound 114 as a function of the width x and the height y. Volumetables 262 and 264 define the volume V_(wound) of wound 114 as afunction of the area A_(wound) specified by area table 260 and the depthz of wound 114. For example, a given rectangular-shaped wound 114 mayhave a width of 5 cm, a height of 6 cm, and a depth of 2 cm. Area table260 defines the area A_(wound) of such a wound as 30 cm². Volume table262 is specific to a wounds having a depth of 2 cm, whereas volume table264 is specific to wounds having a depth of 3 cm. Because the wound hasa volume of 2 cm, volume table 262 can be used to find the volumeV_(wound) corresponding to the area of 30 cm², which is shown in volumetable 262 as 60 cm³.

Referring now to FIG. 11, a set of ellipse cylinder reference tables270, 272, and 274 are shown. Ellipse cylinder reference tables 270-274can be used to estimate the volume of wound 114 when wound 114 has anellipse cylinder wound shape 206 b. Area table 270 defines the areaA_(wound) of wound 114 as a function of the width x and the height y.Volume tables 272 and 274 define the volume V_(wound) of wound 114 as afunction of the area A_(wound) specified by area table 270 and the depthz of wound 114. For example, a given ellipse cylinder-shaped wound 114may have a width of 3 cm, a height of 7 cm, and a depth of 2 cm. Areatable 270 defines the area A_(wound) of such a wound as 16 cm². Volumetable 272 is specific to a wounds having a depth of 2 cm, whereas volumetable 274 is specific to wounds having a depth of 3 cm. Because thewound has a volume of 2 cm, volume table 272 can be used to find thevolume V_(wound) corresponding to the area of 16 cm², which is shown involume table 272 as 33 cm³.

Referring now to FIG. 12, a set of prolate ellipsoid reference tables280, 282, and 284 are shown. Prolate ellipsoid reference tables 280-284can be used to estimate the volume of wound 114 when wound 114 has aprolate ellipsoid wound shape 206 c. Area table 280 defines the areaA_(wound) of wound 114 as a function of the width x and the height y.Volume tables 282 and 284 define the volume V_(wound) of wound 114 as afunction of the area A_(wound) specified by area table 280 and the depthz of wound 114. For example, a given prolate ellipsoid-shaped wound 114may have a width of 4 cm, a height of 9 cm, and a depth of 3 cm. Areatable 280 defines the area A_(wound) of such a wound as 28 cm². Volumetable 282 is specific to a wounds having a depth of 2 cm, whereas volumetable 284 is specific to wounds having a depth of 3 cm. Because thewound has a volume of 3 cm, volume table 284 can be used to find thevolume V_(wound) corresponding to the area of 28 cm², which is shown involume table 284 as 38 cm³. Notably, the volumes defined by volumetables 282-284 are half the volumes of a prolate ellipsoid having thespecified width x, height y, depth z because wound 114 is only thebottom half of the prolate ellipsoid.

Flow Diagrams

Referring now to FIG. 13, a flowchart of a process 300 for deliveringinstillation fluid to a wound is shown, according to an exemplaryembodiment. Process 300 can be performed by one or more components oftherapy device 102. For example, process 300 can be performed bycontroller 118, user interface 126, pneumatic pump 120, and/or othercomponents of therapy device 102.

Process 300 is shown to include measuring a wound size, identifying ageometric wound shape, and inputting the wound shape and wound sizemeasurements into therapy device 102 (step 302). In some embodiments,step 302 is performed by a clinician using measurement tool 250. Forexample, the clinician can use measurement tool 250 to measure the widthand height of wound 114. A separate ruler can be used to measure thedepth of wound 114. The clinician can determine whether the geometricshape of wound 114 is most similar to rectangular wound shape 206 a,ellipse cylinder wound shape 206 b, prolate ellipsoid wound shape 206 c,triangular wound shape 206 d, or any other wound shape that has acorresponding wound volume model within therapy device 102. The woundmeasurements and the wound shape can be input to therapy device 102 viauser interface 126.

Process 300 is shown to include selecting a wound volume modelcorresponding to the identified geometric wound shape (step 304). Insome embodiments, step 304 is performed by wound volume model selector154. Wound volume model selector 154 may store a variety of differentwound volume models, each of which corresponds to a different woundshape. Each wound volume model may be a geometric model that defines thevolume V_(wound) of wound 114 as a function of the geometric attributesreceived via user interface 126 (e.g., the width x, height y, and depthz of wound 114). The function that relates the volume V_(wound) of wound114 to the geometric attributes x, y, and z may vary based on theselected wound shape. Several examples of wound volume models andcorresponding geometric wound shapes 206 a-206 d are described in detailwith reference to FIGS. 7A-7D.

Process 300 is shown to include automatically calculating the woundvolume V_(wound) by applying the measurements of wound 114 to theselected wound volume model (step 306). If the selected wound volumemodel is a rectangular wound volume model, step 306 may includecalculating the volume V_(wound) of wound 114 as a product of the widthx, height y, and depth z as shown in the following equation:

V _(wound) =xyz

where x is the width of wound 114, y is the height of wound 114, and zis the depth of wound 114.

If the selected wound volume model is an ellipse cylinder wound volumemodel, step 306 may include calculating the volume V_(wound) of wound114 as a function of axial radii a and b and cylinder depth c, as shownin the following equation:

V _(wound) =πabc

where a is the axial radius of wound 114 along the width dimension x(i.e., a=x/2), b is the axial radius of wound 114 along the heightdimension y (i.e., b=y/2), and c is the depth of wound 114 along thedepth dimension z (i.e., c=z).

If the selected wound volume model is a prolate ellipsoid wound volumemodel, step 306 may include calculating the volume V_(wound) of wound114 as a function of axial radii a, b, and c, as shown in the followingequation:

V _(wound)=⅔πabc

where a is the axial radius of wound 114 along the width dimension(i.e., a=x/2), b is the axial radius of wound 114 along the heightdimension (i.e., b=y/2), and c is the axial radius of wound 114 alongthe depth dimension (i.e., c=z). The volume V_(wound) of prolateellipsoid wound shape 206 c can be defined as half the volume of aprolate ellipsoid having axial radii a, b, and c.

If the selected wound volume model is a triangular wound volume model,step 306 may include calculating the volume V_(wound) of wound 114 as afunction of the width x, height y, and depth z as shown in the followingequation:

$V_{wound} = \frac{xyz}{2}$

where x is the width of a triangular face of wound 114, y is the heightof wound 114, and z is the depth of a triangular face of wound 114.

In some embodiments, step 306 includes calculating the variables a, b,and c based on the values of x, y, and z for use in the ellipse cylinderwound volume model and the prolate ellipsoid wound volume model, asshown in the following equations:

${a = \frac{x}{2}}{b = \frac{y}{2}}{c = z}$

Process 300 is shown to include determining a volume V_(fluid) ofinstillation fluid 105 to deliver to wound 114 based on the volumeV_(wound) of wound 114 (step 308) and operating a pump to deliver thedetermined volume V_(fluid) of instillation fluid 105 to wound 114 (step310). In some embodiments, step 308 includes determining the volumeV_(fluid) of instillation fluid 105 to deliver to wound 114 bymultiplying the volume V_(wound) of wound 114 by a fluid instillationfactor α, as shown in the following equation:

V _(fluid) =αV _(wound)

In some embodiments, the fluid instillation factor α is less than onesuch that less than the total volume V_(wound) of wound 114 is filledwith instillation fluid 105. For example, the fluid instillation factorα may be between approximately 0.2 and approximately 0.8. Step 310 mayinclude operating instillation pump 122 to deliver the determined volumeV_(fluid) of instillation fluid 105 to wound 114 (e.g., by providingcontrol signals to pump controller 146).

Referring now to FIG. 14, a flowchart of another process 400 fordelivering instillation fluid to a wound is shown, according to anexemplary embodiment. Process 400 can be performed by one or morecomponents of therapy device 102. For example, process 300 can beperformed by controller 118, user interface 126, pneumatic pump 120,and/or other components of therapy device 102.

Process 400 is shown to include measuring a wound size and identifying ageometric wound shape (step 402). In some embodiments, step 402 isperformed by a clinician using measurement tool 250. For example, theclinician can use measurement tool 250 to measure the width and heightof wound 114. A separate ruler can be used to measure the depth of wound114. The clinician can determine whether the geometric shape of wound114 is most similar to rectangular wound shape 206 a, ellipse cylinderwound shape 206 b, prolate ellipsoid wound shape 206 c, triangular woundshape 206 d, or any other wound shape that has a corresponding referencetable for estimating the wound volume.

Process 400 is shown to include using a corresponding reference table todetermine the wound volume based on the wound size measurements and thegeometric wound shape (step 404). Each geometric wound shape may have acorresponding reference table or set of reference tables. For example,reference tables 260-264 can be used to determine the wound volumeV_(wound) for wounds having a rectangular wound shape 206 a. Referencetables 270-274 can be used to determine the wound volume V_(wound) forwounds having an ellipse cylinder wound shape 206 b. Reference tables280-284 can be used to determine the wound volume V_(wound) for woundshaving a prolate ellipsoid wound shape 206 c. The wound volume V_(wound)specified by the reference tables can then be input to therapy device102 via user interface 126 (step 406).

Process 400 is shown to include determining a volume V_(fluid) ofinstillation fluid 105 to deliver to wound 114 based on the volumeV_(wound) of wound 114 (step 408) and operating a pump to deliver thedetermined volume V_(fluid) of instillation fluid 105 to wound 114 (step410). In some embodiments, step 408 includes determining the volumeV_(fluid) of instillation fluid 105 to deliver to wound 114 bymultiplying the volume V_(wound) of wound 114 by a fluid instillationfactor α, as shown in the following equation:

V _(fluid) =αV _(wound)

In some embodiments, the fluid instillation factor α is less than onesuch that less than the total volume V_(wound) of wound 114 is filledwith instillation fluid 105. For example, the fluid instillation factorα may be between approximately 0.2 and approximately 0.8. Step 410 mayinclude operating instillation pump 122 to deliver the determined volumeV_(fluid) of instillation fluid 105 to wound 114 (e.g., by providingcontrol signals to pump controller 146).

Configuration of Exemplary Embodiments

The construction and arrangement of the systems and methods as shown inthe various exemplary embodiments are illustrative only. Although only afew embodiments have been described in detail in this disclosure, manymodifications are possible (e.g., variations in sizes, dimensions,structures, shapes and proportions of the various elements, values ofparameters, mounting arrangements, use of materials, colors,orientations, etc.). For example, the position of elements can bereversed or otherwise varied and the nature or number of discreteelements or positions can be altered or varied. Accordingly, all suchmodifications are intended to be included within the scope of thepresent disclosure. The order or sequence of any process or method stepscan be varied or re-sequenced according to alternative embodiments.Other substitutions, modifications, changes, and omissions can be madein the design, operating conditions and arrangement of the exemplaryembodiments without departing from the scope of the present disclosure.

The present disclosure contemplates methods, systems and programproducts on any machine-readable media for accomplishing variousoperations. The embodiments of the present disclosure can be implementedusing existing computer processors, or by a special purpose computerprocessor for an appropriate system, incorporated for this or anotherpurpose, or by a hardwired system. Embodiments within the scope of thepresent disclosure include program products comprising machine-readablemedia for carrying or having machine-executable instructions or datastructures stored thereon. Such machine-readable media can be anyavailable media that can be accessed by a general purpose or specialpurpose computer or other machine with a processor. By way of example,such machine-readable media can comprise RAM, ROM, EPROM, EEPROM, CD-ROMor other optical disk storage, magnetic disk storage or other magneticstorage devices, or any other medium which can be used to carry or storedesired program code in the form of machine-executable instructions ordata structures and which can be accessed by a general purpose orspecial purpose computer or other machine with a processor. Combinationsof the above are also included within the scope of machine-readablemedia. Machine-executable instructions include, for example,instructions and data which cause a general purpose computer, specialpurpose computer, or special purpose processing machines to perform acertain function or group of functions.

Although the figures show a specific order of method steps, the order ofthe steps may differ from what is depicted. Also two or more steps canbe performed concurrently or with partial concurrence. Such variationwill depend on the software and hardware systems chosen and on designerchoice. All such variations are within the scope of the disclosure.Likewise, software implementations could be accomplished with standardprogramming techniques with rule based logic and other logic toaccomplish the various connection steps, processing steps, comparisonsteps and decision steps.

1. A wound therapy system comprising: an instillation fluid canisterconfigured to contain an instillation fluid; a pump fluidly coupled tothe instillation fluid canister and operable to deliver the instillationfluid from the instillation fluid canister to a wound; a user interfaceconfigured to receive user input indicating one or more geometricattributes of the wound; and a controller electronically coupled to thepump and the user interface and configured to: determine a volume of thewound based on the user input; determine a volume of the instillationfluid to deliver to the wound based on the volume of the wound; andoperate the pump to deliver the determined volume of the instillationfluid to the wound.
 2. The wound therapy system of claim 1, wherein: theone or more geometric attributes of the wound comprise at least one of awidth, a height, or a depth of the wound; and the controller isconfigured to determine the volume of the wound by applying at least oneof the width, the height, or the depth of the wound as an input to awound volume model.
 3. The wound therapy system of claim 1, wherein: theone or more geometric attributes of the wound comprise a wound shape;and the controller is configured to: select a wound volume model basedon the wound shape; and determine the volume of the wound using theselected wound volume model.
 4. The wound therapy system of claim 3,wherein: the one or more geometric attributes of the wound furthercomprise at least one of a width, a height, or a depth of the wound; andthe controller is configured to determine the volume of the wound byapplying at least one of the width, the height, or the depth of thewound as an input to the selected wound volume model.
 5. The woundtherapy system of claim 3, wherein the wound volume model defines arelationship between the one or more geometric attributes of the woundand the volume of the wound.
 6. The wound therapy system of claim 5,wherein: the wound volume model comprises a rectangular volume model;and the controller is configured to determine the volume of the wound bymultiplying the width, the height, and the depth.
 7. The wound therapysystem of claim 5, wherein: the wound volume model comprises anelliptical cylinder volume model; and the controller is configured todetermine the volume of the wound by: calculating an ellipse area usingthe length and the width; and multiplying the ellipse area by the depth.8. The wound therapy system of claim 5, wherein: the wound volume modelcomprises a prolate ellipsoid volume model; and the controller isconfigured to determine the volume of the wound based on a volume of aprolate ellipsoid having the length, the width, and the depth. 9.(canceled)
 10. The wound therapy system of claim 1, further comprising ameasurement device configured to measure a size of the wound alongmultiple dimensions of the wound simultaneously.
 11. The wound therapysystem of claim 10, wherein the measurement device comprises a graduatedscale printed on packaging of the wound therapy system.
 12. (canceled)13. The wound therapy system of claim 1, further comprising one or moretables that define the volume of the wound as a function of the one ormore geometric attributes of the wound.
 14. The wound therapy system ofclaim 13, wherein the user input comprises the volume of the wounddefined by the one or more tables.
 15. (canceled)
 16. (canceled) 17.(canceled)
 18. The wound therapy system of claim 1, further comprising awound dressing sealable to skin surrounding the wound.
 19. (canceled)20. (canceled)
 21. The wound therapy system of claim 1, wherein thecontroller is configured to: determine the volume of the wound at aplurality of times during wound treatment; and determine healingprogression based on changes in the volume of the wound during woundtreatment.
 22. A method for delivering instillation fluid to a wound,the method comprising: receiving user input indicating one or moregeometric attributes of the wound at a user interface of a wound therapydevice; determining a volume of the wound based on the user input;determining a volume of the instillation fluid to deliver to the woundbased on the volume of the wound; and operating a pump of the woundtherapy device to deliver the determined volume of the instillationfluid from an instillation fluid canister to the wound.
 23. (canceled)24. The method of claim 22, wherein the one or more geometric attributesof the wound comprise a wound shape; the method further comprising:selecting a wound volume model based on the wound shape; and determiningthe volume of the wound using the selected wound volume model. 25.(canceled)
 26. The method of claim 24, wherein the wound volume modeldefines a relationship between the one or more geometric attributes ofthe wound and the volume of the wound.
 27. The method of claim 26,wherein: the wound volume model comprises a rectangular volume model;and determining the volume of the wound comprises multiplying the width,the height, and the depth.
 28. The method of claim 26, wherein: thewound volume model comprises an elliptical cylinder volume model; anddetermining the volume of the wound comprises: calculating an ellipsearea using the length and the width; and multiplying the ellipse area bythe depth.
 29. The method of claim 26, wherein: the wound volume modelcomprises a prolate ellipsoid volume model; and determining the volumeof the wound based on a volume of a prolate ellipsoid having the length,the width, and the depth.
 30. The method of claim 29, whereindetermining the volume of the wound comprises calculating half thevolume of the prolate ellipsoid having the length, the width, and thedepth.
 31. (canceled)
 32. (canceled)
 33. (canceled)
 34. The method ofclaim 22, further comprising using one or more tables to determine thevolume of the wound as a function of the one or more geometricattributes of the wound.
 35. (canceled)
 36. (canceled)
 37. (canceled)38. (canceled)
 39. The method of claim 22, further comprising sealing awound dressing to skin surrounding the wound.
 40. The method of claim22, further comprising fluidly coupling the pump with the wound viatubing; wherein the determined volume of the instillation fluid isdelivered to the wound via the tubing.
 41. (canceled)
 42. The method ofclaim 22, further comprising: determining the volume of the wound at aplurality of times during wound treatment; and determining healingprogression based on changes in the volume of the wound during woundtreatment.